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We present the discovery and analysis of J1316+2614 at z=3.6130, a UV-brightstar-forming galaxy ($M_{\rm UV} \simeq -24.7$) with large escape of Lymancontinuum (LyC) radiation. J1316+2614 is a young ($\simeq 10$ Myr) star-forminggalaxy with $SFR \simeq 500 M_{\odot}$ yr$^{-1}$ and a starburst mass oflog($M_{\star}/M_{\odot}) \simeq 9.7$. It shows a very steep UV continuum,$\beta_{\rm UV} \simeq -2.59 \pm 0.05$, consistent with residual dustobscuration, $E(B-V)\simeq 0$. LyC emission is detected with high significance($\simeq 17 \sigma$) down to $830$\r{A}, for which a very high relative(absolute) LyC escape fraction $f_{\rm esc} \rm (LyC) \simeq 0.92$ ($\simeq0.87$) is inferred. The contribution of a foreground or AGN contamination tothe LyC signal is discussed but is unlikely. J1316$+$2614 is the most powerfulionizing source known among the star-forming galaxy population, both in termsof production ($Q_{\rm H} \approx 10^{56}$ s$^{-1}$) and escape of ionizingphotons ($f_{\rm esc} \rm (LyC) \approx 0.9$). Nebular emission in Ly$\alpha$,H$\beta$, and other rest-frame optical lines are detected, but these are weak($EW_{0} \rm [H\beta] \simeq 35$\r{A}), with their strengths reduced roughly by$\simeq 90\%$. J1316+2614 is the first case known where the effect of largeescape of ionizing photons on the strength of nebular lines and continuumemission is clearly observed. Gas inflows are detected in J1316+2614 from theblue-dominated peak Ly$\alpha$ emission (with a blue-to-red peak line ratio$I_{\rm blue}/I_{\rm red} \simeq 3.7$) and redshifted ISM absorption ($\simeq100$ km s$^{-1}$). Our results suggest that J1316+2614 is undergoing a gascompaction event, possibly representing a short-lived phase in the evolution ofmassive and compact galaxies, where strong gas inflows have triggered anextreme star formation episode and nearly $100\%$ LyC photons are escaping.

An extreme blue nugget, UV-bright starburst at z=3.613 with ninety per cent of Lyman continuum photon escape